1. Viruses that don't have an envelope have evolved to survive without the envelope. Viruses that do have an envelope haven't. Are you confused that removing a

1. Viruses that don't have an envelope have evolved to survive without the envelope. Viruses that do have an envelope haven't. Are you confused that removing a crab's exoskeleton kills it, given that there are lots of animals that don't have exoskeletons? 2. This is probably just sloppy usage of "some" and "most". That said, i think enveloped viruses are overrepresented amongst viruses that cause serious disease in humans, because the envelope helps them evade the immune system. 3. Some viruses don't have a capsid [1]! Coronaviruses do, though, so that's just missing from that diagram. 4. Surfactants like soaps do disrupt protein, but typically not as effectively as they disrupt lipid bilayers. There are numerous techniques in biochemistry and cell biology that depend on this fact - permeabilising cells for immunocytochemistry, or preparing membrane proteins for crystallisation, for example. You have to boil proteins in powerful detergents to be sure of denaturing them. [1] http://www.virology.ws/2010/09/23/a-new-type-of-enveloped-virus/ http://www.virology.ws/2010/09/23/a-new-type-of-enveloped-vi...